Hi,

It's my first time writing an (original) patch for ffmpeg, so I would like your 
help.

I’m planning to propose a diff to an encoder param for aac_at, which is, as 
currently listed by "ffmpeg -h encoder=aac_at”:

  -aac_at_quality    <int>        E...A...... quality vs speed control (from 0 
to 2) (default 0)

Currently, 0 uses HIGH, and 1, 2 use MID, LOW quality encodings.

I’d like to change this param so that all 5 levels listed by Apple (MAX, HIGH, 
MID, LOW, MIN) can be used.

Do I change it to:

  -aac_at_quality    <int>        E...A...... quality vs speed control (from 0 
to 4) (default 0)

and migrate everyone to a higher-quality encoding preset

or
  -aac_at_quality    <int>        E...A...... quality vs speed control (from -1 
to 3) (default -1)

so that previous levels are kept as they are, adding only MAX and MIN, which 
were previously out of range.

I’d like to know: Which of these aligns better with FFMPEG’s policies?

Many thanks
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